Here are some of his notable works:
Novels:
* Violence (1971) - considered his most famous work, it deals with the themes of violence, corruption, and poverty in Nigeria.
* The Contract (1981) - explores the exploitation of labor in the oil industry.
* Heroes (1984) - focuses on the struggles of students and their involvement in the Nigerian Civil War.
* Awaiting the Dawn (1987) - examines the social and economic inequalities in Nigeria.
* The Witch (2001) - deals with the theme of female power and the struggle for women's rights in a patriarchal society.
Plays:
* The Road
* The Return
* The Trial
Short Story Collections:
* The Black Shirt and Other Stories
* The Return of the Prodigal
* The Exile
Iyayi's works are characterized by their realism, social commentary, and engagement with political issues. He was a passionate advocate for social justice and used his writing to highlight the struggles of the marginalized. He was tragically killed in 2012 in a road accident.